Laro Corporation produces and sells a single product with the following characteristics: Per unit Percent of sales Selling price $ 260 100% Variable expenses 130 50% Contribution margin $ 130 50% The company is currently selling 6,100 units per month. Fixed expenses are $335,000 per month. The marketing manager would like to introduce sales commissions as an incentive for the sales staff. The marketing manager has proposed a commission of $10 per unit. In exchange, the sales staff would accept a decrease in their salaries of $51,000 per month. (This is the company's savings for the entire sales staff.) The marketing manager predicts that introducing this sales incentive would increase monthly sales by 210 units. What should be the overall effect on the company's monthly net operating income of this change? increase of $808,200 increase of $15,200 decrease of $86,800 increase of $50,790